GridLayout android.view.ViewGroup$LayoutParams cannot be cast to android.support.v7.widget.GridLayout$LayoutParams

Question

I have GridLayout as child view, with set (empty) GridLayout.LayoutParams

setLayoutParams(new GridLayout.LayoutParams());

I do not set LayoutParams to this anywhere else. But I'm getting exception

E/AndroidRuntime( 1620): FATAL EXCEPTION: main
E/AndroidRuntime( 1620): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams cannot be cast to android.support.v7.widget.GridLayout$LayoutParams
E/AndroidRuntime( 1620):    at android.support.v7.widget.GridLayout.computeLayoutParamsHashCode(GridLayout.java:872)
E/AndroidRuntime( 1620):    at android.support.v7.widget.GridLayout.checkForLayoutParamsModification(GridLayout.java:879)
E/AndroidRuntime( 1620):    at android.support.v7.widget.GridLayout.onMeasure(GridLayout.java:927)
E/AndroidRuntime( 1620):    at android.view.View.measure(View.java:15172)
E/AndroidRuntime( 1620):    at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1249)
E/AndroidRuntime( 1620):    at android.view.View.measure(View.java:15172)
E/AndroidRuntime( 1620):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
E/AndroidRuntime( 1620):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
E/AndroidRuntime( 1620):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
E/AndroidRuntime( 1620):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
E/AndroidRuntime( 1620):    at android.view.View.measure(View.java:15172)
E/AndroidRuntime( 1620):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
E/AndroidRuntime( 1620):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
E/AndroidRuntime( 1620):    at android.view.View.measure(View.java:15172)
E/AndroidRuntime( 1620):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
E/AndroidRuntime( 1620):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1390)
E/AndroidRuntime( 1620):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:681)
E/AndroidRuntime( 1620):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
E/AndroidRuntime( 1620):    at android.view.View.measure(View.java:15172)
E/AndroidRuntime( 1620):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4814)
E/AndroidRuntime( 1620):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
E/AndroidRuntime( 1620):    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148)
E/AndroidRuntime( 1620):    at android.view.View.measure(View.java:15172)
E/AndroidRuntime( 1620):    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1848)
E/AndroidRuntime( 1620):    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1100)
E/AndroidRuntime( 1620):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1273)
E/AndroidRuntime( 1620):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998)
E/AndroidRuntime( 1620):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4212)
E/AndroidRuntime( 1620):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
E/AndroidRuntime( 1620):    at android.view.Choreographer.doCallbacks(Choreographer.java:555)
E/AndroidRuntime( 1620):    at android.view.Choreographer.doFrame(Choreographer.java:525)
E/AndroidRuntime( 1620):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
E/AndroidRuntime( 1620):    at android.os.Handler.handleCallback(Handler.java:615)
E/AndroidRuntime( 1620):    at android.os.Handler.dispatchMessage(Handler.java:92)
E/AndroidRuntime( 1620):    at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime( 1620):    at android.app.ActivityThread.main(ActivityThread.java:4745)
E/AndroidRuntime( 1620):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 1620):    at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime( 1620):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
E/AndroidRuntime( 1620):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
E/AndroidRuntime( 1620):    at dalvik.system.NativeStart.main(Native Method)
W/ActivityManager(  304):   Force finishing activity com.capsule.launcher/.LauncherActivity

Why?

Answer 1

Are you passing a GridLayout.LayoutParams to the GridLayout itself? I don't believe that's right.

When you call setLayoutParams , you're providing information to the parent class about how to layout the particular child. You should pass a <ParentClass>.LayoutParams to the GridLayout, where ParentClass is whatever container the GridLayout is in.

GridLayout.LayoutParams is only for setting the layoutParams for the children of a GridLayout .

Answer 2

Which version of Android Api your app uses? Looks like it uses Api 14 or above and You also use android support library. Error described in question is possible when you try to pass GridLayout.LayoutParams() from Api 14 to GridLayout.setLayoutParams from support library. Please, check your imports.